protocol --write-out # Server-side HTTP/1.1 200 OK Date: Thu, 09 Nov 2010 14:49:00 GMT Content-Length: 9 Connection: close Content-Type: text/plain testdata # Client-side http Check if %{stderr} and %{stdout} switch between stdout and stderr. http://%HOSTIP:%HTTPPORT/1457 --silent --write-out 'line1%{stderr}line2%{stdout}line3' # Verify data HTTP/1.1 200 OK Date: Thu, 09 Nov 2010 14:49:00 GMT Content-Length: 9 Connection: close Content-Type: text/plain testdata line1line3 line2 GET /1457 HTTP/1.1 Host: %HOSTIP:%HTTPPORT User-Agent: curl/%VERSION Accept: */*